What sampling device is used to recover long, undisturbed sediment cores from the seabed?

What sampling device is used to recover long, undisturbed sediment cores from the seabed?

• A. Piston Corer
• B. Radiolarian
• C. Sand
• D. Oolite Sands

Answer: (A)

Recovering long, undisturbed sediment records from the seabed requires a coring tool that preserves the original layering. A piston corer achieves this by using a piston inside the core barrel that moves as the barrel is driven into the sediment. The piston seals the bore and reduces friction and water influx, so the sediment column isn’t compressed or disturbed during retrieval. This allows the full vertical sequence to be recovered with minimal disturbance, which is essential for studying deposition over time and the history recorded in the sediments. The other options aren’t sampling devices: radiolarian refers to microscopic fossils used for dating and content analysis, while sand and oolite sands are sediment types, not tools for collecting cores.

Recovering long, undisturbed sediment records from the seabed requires a coring tool that preserves the original layering. A piston corer achieves this by using a piston inside the core barrel that moves as the barrel is driven into the sediment. The piston seals the bore and reduces friction and water influx, so the sediment column isn’t compressed or disturbed during retrieval. This allows the full vertical sequence to be recovered with minimal disturbance, which is essential for studying deposition over time and the history recorded in the sediments. The other options aren’t sampling devices: radiolarian refers to microscopic fossils used for dating and content analysis, while sand and oolite sands are sediment types, not tools for collecting cores.